在如图所示电路的〇里填上适当的电表符号，使之成为正确的电路．
用所给词的适当形式填空。
1. If I (fail) the exam, you wouldn't be so happy.
2. If I (be) there, I would stop him from doing so.
3. If it (be) fine tomorrow, we (go) shopping.
4. He (help) us if he had time.
5. He showed us how (get) to the hall with the ID card.
